Lock



C. LIBERMAN.

LOCK.

APPLICATION FILED uEc.2s,192o.

1,399,568, Patented Dec. 6, 1921.

, Q @ZLEJ'LZEEAE/MY WITNESSES 25 a W W ATTORNEYS ToaZl'uihom/it mag/concern UNIT ED CHARLES LIBERMLAN, OF NEW YORK, N. Y.

Loom

'] Application filed. December 2a, 1920. sen-a1 a... 433,711.

Be it known that I, Cnannrs Then-Imam, a

citizen of the United States, and aresident the city of NewYork, borough "of lid-air liattan, in the county and Stateoit New i1 ork,

have invented anew andImprovedLock, oil? which the following is a fullyclear antler-act description. y

nt on relates to. locksQsuch as The inv shown and described in the applicationv for Letters Patent fol the United States; No.

366,741, filed by ineon hil arch 18, 1920.

The objectof theinvention is to provide anew and improved lock more especially de signed for use on doors and arranged to lock the door securely f and to prevent opening thereof by unauthorized persons.

Another ob]ect is to prevent retraction of the bolt by the insertion andinanipulation of thin bladed tools or other implements.

With these and other objects in view, the invention consists of certain novel features of construction as hereinafter shown and described and then. specifically pointed out in the claims.

A practical embodiment oi the invention is represented in the accompanying drawings forming a part of this specification. in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a front view of the improved look as applied to a door;

Fig. 2 is a cross section of the same on the line 22 of Fig. 1;

Fig. 3 is a sectional plan view of the same on the line 3-3 of Fig. 2;

Fig. 4 is a sectional rear view of the same i on the line 1-4 of Fig. 3, and

Fig. 5 is an end elevation of the improved lock.

The lock illustrated in the drawings is in the form of a face lock having its casing 10 fastened by screws 11 to the inner face of a door 12. The outer end of the casing 10 pro jects onto the door casing 13 on which is fastened. a. keeper 14- by bolts 15 or other fastening means. The keeper 15 projects into an opening 16 formed between two spaced bearings 17 and 18 integral with the outer end of the lock casing 10. The bearings 17 and 18 and the opening 19 of the keeper 14: are adapted. to be engaged. by a bolt head 20 hav ing a shank 21 mounted to rotate in abolt 22 adapted to slide forward and backward in the lock casing 10. The bolt head 20 is twisted or spirally fluted and the bearlngs 17 and; 18 are shaped to correspond to thefcross sectional area of the said bolt head 2-0, and the sa1d bearings 17, 18 are offset one relative to the other (see Fig. 5) according to the twist or spiral fluting oi the bolt head 20. The bolt head 20 is in engagement with the bearing 17 whetherthe bolt 22 is in retracted or shot-out positionfand when the bolt 1s in retracted position the outer face of the bolt head 20 is flush withthe outer place of the bearing 17 and hence the opening 16 is unobstructed tor the'entrance of the keeper 14; on closing the door 12. Like wise when the bolt 22 is in retracted position the door canbe swung open to disconnect the Patented Dec. 6, 1921.

keeper 14 from the opening 16. WVhen the bolt 22 is moved into outwardilocking position at the time the door 12 is closed then the boltjhead 20 on accountof being in engagement with the bearing 17 is given a rotary motionwhile moving outward and in doing so the bolt head 20 is passed through the circular opening 19 in the keeper 14 and then engages the bearing 18, and when the bolt is in outermost locking position it engages both bearings 17 and 18 as well as the keeper 14:. As the bolt head 20 fits the bearings 17 and 18 it is evident that the bolt head cannot be turned and retracted by the insertion of a thin bladed tool or other implement between the keeper and the inner bearing 17 as is so frequently practised by burglars and other unauthorized persons in jimmying a door.

The bolt 22 is preferably key-controlled from the outside by a suitable lock 30 hava rollback 31 and from the inside by a knob 32 having a rollback The rollbaeks 31 and 33 are adapted to impart a sliding move ment to the bolt 22 in the usual manner and? the rollbacks also control a locking lever 34 fulcrumied at 35 on the bolt 22 and: pressed. on by a spring 36. The lever 3 1 is provided at its free end with a lug 37 adapted to be engaged by either of the rollhacks 31 or 33 and the said locking lever is provided with a locking lug 38 adapted to engage either side of a post 39 fixed in the easing 10. When. the bolt 22 is in shot-out position, as shown in the drawings the lug 38 is in engagement with the front of the post 39 and hence the bolt is held against accidental return movement unless the rollback 31 or swings: the locking lever 341 into unlocking position, that is, moving the lug 38 out of the path of the post 39 to permit Ward movement, it being understood that prior to shooting the bolt 22 outward; by eitherof the rollba'cks 31 or 33 the latter moves the locking lever 34 into unlocking position relative to the post 39.

The knob 32 is preferably: provided with f a spring-pressed locking pin 40 adapted to engage either of two diametiically oppositely disposed recesses 41 formed in the face of the casing 10 to hold the knob 32 against accidental turning (see Fig. 3).

7 Having thus described my invention, I.

claim as IIGW- and desire to secure by Letters I Patent:

1. In a lock, afboltmounted, to slide and having. a revoluble spirally fluted head, a casing provided with spaced bolt bearings for the bolt head to slidein and correspond- .j ing to the cross sectional area of the said bolt head, and a keeper adapted to pass between the said bearings and-having an openingffor the passage ofthe said bolt head 2. In a look, a bolt. mounted to slide and having a revoluble spirally fluted head, a

casing-provided with spaced bolt bearings for the bolt head to slide in and corresponding to the cross sectional area of the said bolt head, the bearings being offset one relative to the other according to the pitch of the spiral flutes of the said bolt head, and

a keeper adapted to pass between the said bearings and having an opening for the passage of the said bolt head.

3. In a look, .a bolt mounted to slide and having a revoluble spirally fluted head, a casing provided with spaced bearings for the 'said bolt head to slide and to turn in, the bearings corresponding in shape to the cross sectional area of the said bolt head to rotate the latter on imparting a sliding movement to the bolt, a rollback controlling the sliding movement of the said bolt, :1, post fixed in the casing, a spring-pressed locking lever fulcrumed on the said bolt and having spaced lugs, of which one is adapted to move into locking engagement with the said post to hold the post against sidewise movement, the other lug being adapted to be engaged by the said rollback to unlock the locking lever, and a keeper adapted to pass between the said bearings to be engaged by the said bolt head.

CHARLES LIBERMAN. 

